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• Additional costs due to license fees, gas generation, control modules, special nozzle/needle, cost for N2

• Non-uniform wall thickness (cross-section)

• Limited reproduction of mold surface (textured)

• Surface marks due to melt-to-gas switch-over (hesitation)

• Limitations to material changes (wall thickness changes too)

• Usually "open" gas injection point

• More development work is required

• Possible surface marks

• Multiple cavities are difficult to fill compared to standard injection molding

• Gas channel formation is difficult to calculate/predict (weld lines)